Mean radiant temperature - Revision history

Designing Buildings at 08:06, 9 September 2020

2020-09-09T08:06:02Z

← Older revision		Revision as of 08:06, 9 September 2020
Line 33:		Line 33:
	* Wet-bulb temperature.		* Wet-bulb temperature.

−	[[Category:~~Standards_/_measurements~~]] [[Category:~~DCN_Standard~~]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Standards_/_measurements]]

Editor at 15:11, 21 November 2018

2018-11-21T15:11:43Z

← Older revision		Revision as of 15:11, 21 November 2018
Line 1:		Line 1:
−	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as well as personal factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.	+	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window.
		+
		+	Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as well as personal factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.

	[[File:Thermal_comfort.jpg\|link=File:Thermal_comfort.jpg]]		[[File:Thermal_comfort.jpg\|link=File:Thermal_comfort.jpg]]
Line 15:		Line 17:
	Note: This equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010, however, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. Thanks for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.		Note: This equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010, however, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. Thanks for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Dry-bulb temperature.		* Dry-bulb temperature.
	* Emissivity.		* Emissivity.
	* Globe temperature.		* Globe temperature.
		+	* Heat loss.
	* Operative temperature.		* Operative temperature.
	* Predicted mean vote.		* Predicted mean vote.
Line 32:		Line 33:
	* Wet-bulb temperature.		* Wet-bulb temperature.

−	[[Category:Standards_/_measurements]]	+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]]

Designing Buildings: Reverted edits by 108.171.128.189 (talk) to last revision by 88.108.13.200

2018-01-08T20:32:53Z

Reverted edits by 108.171.128.189 (talk) to last revision by 88.108.13.200

← Older revision		Revision as of 20:32, 8 January 2018
Line 1:		Line 1:
−	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.	+	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as well as personal factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.

		+	[[File:Thermal_comfort.jpg\|link=File:Thermal_comfort.jpg]]

		+	Mean radiant temperature (MRT) is a measure of the average temperature of the surfaces that surround a particular point, with which it will exchange thermal radiation. If the point is exposed to the outside, this may include the sky temperature and solar radiation.
		+
		+	The knowledge of surface geometries required to predict mean radiant temperature is very complex, particularly in elaborate spaces. However, mean radiant temperatures can be calculated by some proprietary software applications.
		+
		+	Mean radiant temperature can be measured using a globe thermometer. This is a hollow copper sphere painted matt black (to give it a high emissivity) with a temperature sensor at its centre.
		+
		+	From the temperature recorded, along with air velocity and air temperature (needed to account for convective heat exchange), the mean radiant temperature can be calculated:
		+
		+	MRT = globe temperature + 2.42 x air velocity in m/s (globe temperature – air temperature)
		+
		+	Note: This equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010, however, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. Thanks for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.
		+
		+	= Find out more =

	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===

−	*	+	* Dry-bulb temperature.
		+	* Emissivity.
		+	* Globe temperature.
		+	* Operative temperature.
		+	* Predicted mean vote.
		+	* Psychometric chart.
		+	* Running mean temperature.
		+	* Sling psychrometer.
		+	* Thermal comfort.
		+	* Thermal indices.
		+	* Temperature.
	* Wet-bulb temperature.		* Wet-bulb temperature.

	[[Category:Standards_/_measurements]]		[[Category:Standards_/_measurements]]

108.171.128.189 at 12:20, 8 January 2018

2018-01-08T12:20:11Z

← Older revision		Revision as of 12:20, 8 January 2018
Line 1:		Line 1:
−	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as ~~well as personal~~ factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.	+	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.

−	~~[[File:Thermal_comfort.jpg\|link=File:Thermal_comfort.jpg]]~~

−	Mean radiant temperature (MRT) is a measure of the average temperature of the surfaces that surround a particular point, with which it will exchange thermal radiation. If the point is exposed to the outside, this may include the sky temperature and solar radiation.
−
−	The knowledge of surface geometries required to predict mean radiant temperature is very complex, particularly in elaborate spaces. However, mean radiant temperatures can be calculated by some proprietary software applications.
−
−	~~Mean radiant temperature can be measured using a globe thermometer. This is a hollow copper sphere painted matt black (to give it a high emissivity) with a temperature sensor at its centre.~~
−
−	~~From the temperature recorded, along with air velocity and air temperature (needed to account for convective heat exchange), the mean radiant temperature can be calculated:~~
−
−	~~MRT = globe temperature + 2.42 x air velocity in m/s (globe temperature – air temperature)~~
−
−	Note: This equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010, however, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. Thanks for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.
−
−	~~= Find out more =~~

	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===

−	* ~~Dry-bulb temperature.~~	+	*
−	* Emissivity.	+
−	* Globe temperature.	+
−	* Operative temperature.	+
−	* Predicted mean vote.	+
−	* Psychometric chart.	+
−	* Running mean temperature.	+
−	* Sling psychrometer.	+
−	* Thermal comfort.	+
−	* Thermal indices.	+
−	* Temperature.	+
	* Wet-bulb temperature.		* Wet-bulb temperature.

	[[Category:Standards_/_measurements]]		[[Category:Standards_/_measurements]]

88.108.13.200 at 18:40, 9 October 2017

2017-10-09T18:40:05Z

← Older revision		Revision as of 18:40, 9 October 2017
Line 1:		Line 1:
−	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is a an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as well as personal factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.	+	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as well as personal factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.

	[[File:Thermal_comfort.jpg\|link=File:Thermal_comfort.jpg]]		[[File:Thermal_comfort.jpg\|link=File:Thermal_comfort.jpg]]

88.108.13.200 at 18:36, 9 October 2017

2017-10-09T18:36:09Z

← Older revision		Revision as of 18:36, 9 October 2017
Line 13:		Line 13:
	MRT = globe temperature + 2.42 x air velocity in m/s (globe temperature – air temperature)		MRT = globe temperature + 2.42 x air velocity in m/s (globe temperature – air temperature)

−	Note: This is equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010, however, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. Thanks for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.	+	Note: This equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010, however, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. Thanks for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.

	= Find out more =		= Find out more =

Designing Buildings at 06:31, 23 November 2016

2016-11-23T06:31:45Z

← Older revision		Revision as of 06:31, 23 November 2016
Line 13:		Line 13:
	MRT = globe temperature + 2.42 x air velocity in m/s (globe temperature – air temperature)		MRT = globe temperature + 2.42 x air velocity in m/s (globe temperature – air temperature)

−	Note: This is equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010~~. However~~, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. ~~Our thanks~~ for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.	+	Note: This is equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010, however, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. Thanks for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.

	= Find out more =		= Find out more =

Designing Buildings at 06:29, 23 November 2016

2016-11-23T06:29:48Z

← Older revision		Revision as of 06:29, 23 November 2016
Line 1:		Line 1:
−
	All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is a an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as well as personal factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.		All bodies exchange thermal radiation with their surroundings, depending on the difference in their surface temperatures and their emissivity. This radiant exchange is a an important component of the thermal comfort that will be experienced by a person, particularly in places where there may be significant differences in radiant and air temperatures, for example, near a large window. Other factors that influence thermal comfort include: environmental factors, such as air temperature, air velocity, relative humidity and the uniformity of conditions, as well as personal factors such as clothing, metabolic heat, acclimatisation, state of health, expectations, and even access to food and drink.

−	[[File:~~Thermal comfort~~.jpg\|~~RTENOTITLE~~]]~~<br/>~~	+	[[File:Thermal_comfort.jpg\|link=File:Thermal_comfort.jpg]]

	Mean radiant temperature (MRT) is a measure of the average temperature of the surfaces that surround a particular point, with which it will exchange thermal radiation. If the point is exposed to the outside, this may include the sky temperature and solar radiation.		Mean radiant temperature (MRT) is a measure of the average temperature of the surfaces that surround a particular point, with which it will exchange thermal radiation. If the point is exposed to the outside, this may include the sky temperature and solar radiation.
Line 12:		Line 11:
	From the temperature recorded, along with air velocity and air temperature (needed to account for convective heat exchange), the mean radiant temperature can be calculated:		From the temperature recorded, along with air velocity and air temperature (needed to account for convective heat exchange), the mean radiant temperature can be calculated:

−	MRT = globe temperature + 2.42 x air velocity in cm/s (globe temperature – air temperature)	+	MRT = globe temperature + 2.42 x air velocity in m/s (globe temperature – air temperature)

−	(equation ~~ref~~ [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010 ~~– there are many variations on this equation as it is dependent complex factors such as~~ the ~~size and emissivity~~ of the ~~globe thermometer)~~	+	Note: This is equation provides a very simplified rule of thumb. There are many different variations of this equation as it is dependent complex factors such as the size and emissivity of the globe thermometer. This particular example is taken from the [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010. However, the units used in their equation appear to be incorrect, showing air velocity in cm/s rather than m/s. Our thanks for pointing this out go to Dr Robert McLeod, Senior Lecturer Built Environment - Building Services Engineering, School of Environment and Technology at the University of Brighton.

	= Find out more =		= Find out more =

	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Dry-bulb temperature.	+
−	*Emissivity.	+	* Dry-bulb temperature.
−	*Globe temperature.	+	* Emissivity.
−	*Operative temperature.	+	* Globe temperature.
−	*Predicted mean vote.	+	* Operative temperature.
−	*Psychometric chart.	+	* Predicted mean vote.
−	*Running mean temperature.	+	* Psychometric chart.
−	*Sling psychrometer.	+	* Running mean temperature.
−	*Thermal comfort.	+	* Sling psychrometer.
−	*Thermal indices.	+	* Thermal comfort.
−	*Temperature.	+	* Thermal indices.
−	*Wet-bulb temperature.	+	* Temperature.
		+	* Wet-bulb temperature.

	[[Category:Standards_/_measurements]]		[[Category:Standards_/_measurements]]

Designing Buildings at 15:33, 8 July 2014

2014-07-08T15:33:40Z

← Older revision		Revision as of 15:33, 8 July 2014
Line 32:		Line 32:
	*Wet-bulb temperature.		*Wet-bulb temperature.

−	[[Category:~~Sustainability]]~~	+	[[Category:Standards_/_measurements]]
−	~~[[Category:Theory~~]]	+

Designing Buildings at 11:11, 10 January 2014

2014-01-10T11:11:13Z

← Older revision		Revision as of 11:11, 10 January 2014
Line 22:		Line 22:
	*Emissivity.		*Emissivity.
	*Globe temperature.		*Globe temperature.
		+	*Operative temperature.
		+	*Predicted mean vote.
	*Psychometric chart.		*Psychometric chart.
		+	*Running mean temperature.
		+	*Sling psychrometer.
	*Thermal comfort.		*Thermal comfort.
	*Thermal indices.		*Thermal indices.
		+	*Temperature.
	*Wet-bulb temperature.		*Wet-bulb temperature.

	[[Category:Sustainability]]		[[Category:Sustainability]]
	[[Category:Theory]]		[[Category:Theory]]